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Adding within 100

1st Grade

Alabama Course of Study Standards: 13

Add within 100, using concrete models or drawings and strategies based on place value.
  1. Add a two-digit number and a one-digit number.
  2. Add a two-digit number and a multiple of 10.
  3. Demonstrate that in adding two-digit numbers, tens are added to tens, ones are added to ones, and sometimes it is necessary to compose a ten.
  4. Relate the strategy for adding a two-digit number and a one-digit number to a written method and explain the reasoning used.

Arizona Academic Standards: 1.NBT.C.4

Demonstrate understanding of addition within 100, connecting objects or drawings to strategies based on place value (including multiples of 10), properties of operations, and/or the relationship between addition and subtraction. Relate the strategy to a written form. See Table 1.

Common Core State Standards: 1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Georgia Standards of Excellence (GSE): 1.NR.5.1

Use a variety of strategies to solve applicable, mathematical addition and subtraction problems with one- and two-digit whole numbers.

Louisiana Academic Standards: 1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10.
  1. Use concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a number sentence; justify the reasoning used with a written explanation.
  2. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

North Carolina - Standard Course of Study: 1.NBT.4

Using concrete models or drawings, strategies based on place value, properties of operations, and explaining the reasoning used, add, within 100, in the following situations:
  • A two-digit number and a one-digit number
  • A two-digit number and a multiple of 10

New York State Next Generation Learning Standards: 1.NBT.4

Add within 100, including
  • a two-digit number and a one-digit number,
  • a two-digit number and a multiple of 10.
Use concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Understand that in adding two-digit numbers, one adds tens and tens, ones and ones, and sometimes it is necessary to compose a ten.
Relate the strategy to a written representation and explain the reasoning used.
Note on and/or: Students should be taught to use strategies based on place value, properties of operations, and the relationship between addition and subtraction; however, when solving any problem, students can choose any strategy.
Note: A written representation is any way of showing a strategy using words, pictures, or numbers.

Tennessee Academic Standards: 1.NBT.C.4

Add a two-digit number to a one-digit number and a two-digit number to a multiple of ten (within 100). Use concrete models, drawings, strategies based on place value, properties of operations, and/or the relationship between addition and subtraction to explain the reasoning used.

Pennsylvania Core Standards: CC.2.1.1.B.3

Use place-value concepts and properties of operations to add and subtract within 100.

Florida - Benchmarks for Excellent Student Thinking: MA.1.NSO.2.4

Explore the addition of a two-digit number and a one-digit number with sums to 100

Arkansas Academic Standards: 1.CAR.4

Use concrete models or drawings to add within 100, including a two-digit number and a one-digit number as well as a two-digit number and a multiple of ten; relate strategy used to a written expression or equation and explain reasoning.
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